While on the hunt for a serial letter bomber, Don and Charlie disagree over whether a suspected bomber, who had eluded conviction years earlier, is the person responsible for the latest murder. Complicating the situation, they both have to cope with an over-zealous ATF agent who is hell-bent on railroading the suspect despite only flimsy circumstantial evidence.

Meanwhile Alan and Millie bet one another they can each go for 30 days without buying a new consumer item, only food and necessities.